Division mechanism



sept. 29, 1942. A. F. POTT 2,297,243

DIVISION MECHANISM Original Filed Sept. 23, 1931 l1 Sheets-Sheet l Sept. 29, 1942. A. F. PoTT DIVIS ION MECHANISM Sept. 29, 1942. A. F. PoTT 2,297,243

DIVISION MECHANISM Original Filed Sept. 23, 1931 l1 Sheets-Sheet 3 sept. 29, 1942.

A. F. POTT DIVISION MECHANISM Original Filed Sep'b. 25, 1931 1l Sheets-Sheet 4 215121461 215g 212g a Sept. 29, 1942. A. F. PoTT 2,297,243

DIYISION MECHANISM Original Filed Sept. 25, 1931 1l Sheerzs--Sheel 5 A. F. POTT Sept. 29, 1942.

DIVISION MECHANISM Original Filed Sept. 23, 1931 l1 Sheets-Sheet 6 Sept. 29, 1942. A. F. PoTT 2,297,243

DIVISION MECHANISM Original Filed Sept. 23, 1931 ll Sheets-Sheet 7 Sept. 29, 1942. A. F. PoTT 2,297,243

DIVISION MECHANISM Original Filed Sept. 23, 1931 ll Sheets-Sheet 8 Sept. 29, 1942.

A. F. POTT DIVISION MECHANISM Original Filed Sept. 25, 1951 l1 Sheets-Sheet 9 Sept. 29, 1942. A. F. PoTT DIVISION MECHANISM Original Filed Sept. 25, 1931 ll Sheets-Sheet l0 @n um Sm O Sept. 29, 1942. A. F. Por'r- 2,297,243

DIVIS ION MECHANISM original Filed sept. 23, 19:51

l1 Sheets-Sheet l] Patented Sept. 29, 1942 DIVISION MECHANISM August Friedrich Pott, Zella-Mehlis, Germany; vested in the Alien Property Custodian Original application September 23, 1931, Serial No. 564.643. Divided and this application June 10, 1937, Serial ANo. 147,588. In Germany October 2, 1930 3 claims '(cL zas-s3) Y My invention relates to improvements in calculating machines and more particularly to division mechanism for machines of the Mercedes Euclid type disclosed in my Patent No. 2,143,741, of which the present application is a division.

An object of the present invention is to equip a machine of the type above identified with improved simpliiied controls enabling the machine to perform automatic division, and is more particularly directed t means to enable the quotient obtained in the performance of a problem in division to remain in the quotient register of the machine, while a succeeding problem in division is being performed, during which second performance, and as the second quotient; is being determined, it is automatically subtracted digit by digit from the quotient iirst obtained, so that at the completion of the second problem in division the amount remaining on the quotient registerrepresents the difference between the first and second quotients.

Another object is to provide division mechanism under control of a special division key to reverse the direction of rotation of the revolutions counter and a quotient difference key to set the division mechanism without effecting a reversal of the direction of rotation of the revolution counter or quotient register with respect to the accumulator, so that a quotient difference is registered on the revolution counter.

Still another object is to equip a machine of the type specified for the perfomance of automatic division without increasing the standardized overall dimensions of the machine.

Other, and subordinate, objects are also comprehended by my invention, all of which, together with the specific nature of my improvements will be understood when the following description and claims are read with reference to the accompanying drawings.

In said drawings: y

Figure 1 is a view in perspective of a Mercede Euclid calculating machine embodying my improved division mechanism, the cover plate being partly removed to disclose the interior mechanism,

to the revolutions counter RC, and parts of the driving mechanism between the value entering clutch |43 and actuators R,

Figure Vi is a view in front elevation of the mechanism shown inFig, 3,

Figure 5 is a view in perspective of the main drive shaft 5 and the clutch parts thereon, the

parts being shown disassembled for clearness of illustration,

Figure 6 is a view in side elevation of a reverse gearing for the revolutions counter RC the parts being separated for clearness of illustration,

Figure 7 is a view in longitudinal section of said reverse gearing, f

Figure 8 is a plan view illustrating the relation of the parts of said reverse gearing,

Figure 9 is a. plan view of a coupling mechanism forming part of the drive between the differential actuators R and the accumulator A,

Figure 10 is a view in side elevation of said coupling mechanism,

Figure 11 is a view in front elevation of parts of the revolutions counter RC and the driving shaft ||8 therefor.

Figure l2 is a diagrammatic view of said driving shaft ||8 for the revolutions counter RC,

Figure 13 is a View in perspective of the reverse gearing for the carriage C together with parts of the gear conditioning means and other parts associated with said gearing,

Figure 14 is a view in perspective illustrating the motor I, motor contacts 14|, |42, the add andsub keys l, 8, the means for controlling the carriage shift and value entering clutches |40, |43 by said keys, the means for opening and closing said contacts under control of said keys, the differential actuators R set for addition, the means for conditioning said actuators for addition or subtraction under depression of said keys, the automatic actuator conditioning means, the means for conditioning the revolutions counter RC, and other parts of the machine presently described in detail,

Figure 15 is a View in perspective of the special control keys I4, l5, I6, I8 of the machine and parts operated thereby,

Figure 16 is a'view in perspective of a coupling bar 83 forming part of the automatic actuator conditioning mechanism, a coupling link 8| forming part of the quotient difference division mechanism, and a coupling suspension link 88 for operating said bar and connected to the coupling link first named,

Figure 17 is a plan view of the special control keys |l, |5, I6, I8, |8,20, 2|, 28 and a frame 3| in which said keys are mounted,

Figure 18 is a view in perspective of parts of the overdraft mechanism, including the overdraft conditioning bail H20 occupying the position relative to the tens transfer slide determined by the setting of the accumulator for subtraction in a division operation, also a clutch control mechanism, including the clutch control iiap- 80, and operating connections between said flap and the clutch control shaft 152, also the disabling nap i411 and key locking frame 3i, and parts of the mechanism operated by the carriage right shift and left shift keys i5, ifi,

Figure 19 is another view in perspective of the clutch control shaft H52 and parte carried there-x by, a lever 23B forming part of the carriage clutch conditioning means, and devices for interlocking the clutch control shaft with said lever,

Figure 20 is a detail view of parts of the overdraft mechanism,

Figure 21 is a view in perspective of the conditioning means for the carriage clutch itil,

Figure 22 is a fragmentary end View of the add and subtract conditioning means for the revolutions counter RC the means being shown in normal adding position,

Figure 23 is a similar View with the parts in the position they assume upon depression of the division key I6,

Figure 24 is another similar view with the parts in the position they assume under depression of the quotient difference division key I8,

Figure 25 is a perspective view of the difierential actuators R,'part of the drive therefor, and the coupling mechanism between the actuators and the accumulator A, and

Figure 26 is a view in transverse section taken on the line 2li-26 of Fig. 1 looking in the direction indicated by the arrows.

GENERAL ORGANIZATION The usual tiltable carriagr C, surmounting the frame F, is mounted in any suitable manner for denominational step by step shift to the right and to the left, in the rear of the usual denominational rows of value keys K (see Fig. 1). The carriage C supports an accumulator A and a revolutions counter RC visible through sight openings S in a cover plate I1 of the carriage C. The machine is power driven by a motor (Figs. 2 and 14) the armature shaft of which is geared to a main drive shaft 5 by a worm 3 and worm gear 4.

At one side of the value keys K is a group of special control keys, (Fig. 1), including addition and .subtraction keys 1 and 8, designated Add and Sub" respectively, a keyboard clearing key 9 designated Rx, an accumulator clearing key I 0 designated RA, a revolutions counter clearing key designated Rao, and a. repeat lever I2.

On the oppositeV side of the keyboard is another group of special control keys, including a pair of carriage right shift and left shift keys |5 and I4, respectively, a division key I6, and a quotient difference division key I8.

The machine, as shown, is also equipped with a multiplication lever -22, plus and minus computing keys 20 and I9, respectively, a correction key 2| and a minus multiplication key 28.' 'I'he last mentioned keys I9, 20, 2|, 28, the lever 22 together with the keys 1, 8, 9, I0 and form per se no part of the present invention and need merely be identified in passing.

Value settingv up mechanism The value keys K operate value setting up mechanism forming the subject matter of U. S.

Patent No. 1,935,858 to which attention is invited for an understanding of the details thereof. Briey described, said mechanism comprises sev-= eral denominational series of settable value entering gears 300, Sti, 302, 303, ttt, (Fig. 25), one series for each row of value keys K. These gears are splined upon suitably journaled shafts 305, extending longitudinally of the machine each of which shafts has xed thereon a driving gear 305 for operating the corresponding de nominational. wheel of the accumulator A, as presently described.

The value keys K, when depressed in the setting up of an item, are locked depressed by key locking bars M9, one for each row, tensioned for movement to locking position and movable upon depression of one key of a related row to release another key of said row, all as disclosed in the above noted Patent No. 1,935,858.

The dz'erentz'al mechanism As is well known, the Mercedes Euclid calculating machine is an adding mechanism equipped with differential actuating mechanism conditionable under control of the add and sub keys 1 and '8 to add either the actual or the complemental values set up in the value setting up mechanism. For a detailed disclosure of the differential actuating mechanism reference may be had to U. S. Patent No. 1,011,617. For present purposes it may be explained that said mechanism comprises a series of ten actuator racks, designated as a. unit at R in Fig. 25, reciprocable transversely of the machine, and with which the before described value entering gears* 300 to 304 mesh in their different set positions. The racks R are conditionable for movement in different degrees on their forward strokes to rotate said gears in accordance with either the actual or the complemental values of the depressed value keys K. The conditioning of the actuators R for addition is accomplished by locking one outside rack |00 againstmovement and by similarly locking the other outside rack |05 for subtraction. To this end, a locking bolt 99 arranged transversely to the rack, is slidably mounted in any suitable manner for setting in opposite directions to interlock with said racks |00 and |05, respectively, by projection of one or the other of its ends into apertures |00a and |05B in said outside racks, respectively. The bolt 99 forms part of an actuator conditioning or add and subtract conditioning means to be described.

Accumulator The accumulator A comprises the usual denominational accumulator wheels 301 (Figs. 1, 25 and 26) bearing on their peripheries the series of symbols 0 to "9 and fast upon hollow shafts 3|| suitably journaled in the carriage 'C. The hollow shafts 3|| have fast thereon gears 3|0, driven -by the before-mentioned coupling mechanism to be described. Associated with the accumulator wheels 301 is a tens transfer mechanism (Figs. 25 and 26), including transfer dogs 3|2, the dog- |32 (Fig. 18), located only in the highest order. This special dog will be particularly described under the title Division mechanism. All the transfer dogs 3|2, |32 are operated in sequence upon each operation of the machine, by a series of cams |92 (Figs. 9 and 10), spirally arranged about a driven shaft |93.

Whether or not the operation of the respective dogs SI2 shall be effective is determined by the positioning or non-positioning of slides 3|2 under control of the accumulator into the paths of the upper beveled ends of the dogs. The dogs are restored to their home positions by a bail 3I2b. The transfer mechanism, being well known and understood in the art, need not be entered into herein. For a detailed disclosure thereof attention is directed to U. S. Patents Nos. 1,011,- 617 and 1,566,961. The usual knobs 3| i provide for manually setting values in the accumulator wheels 301 at will.

shafts 3||, (Figs. 1 and 26), in the rear-of the accumulator wheels 301, are denominational revolutions `counter wheels 300a each having on its periphery the series of symbols 0 to 9 reversely arranged relative to the symbols on its related accumulator wheel 301. The counter wheels 300n are each rotated step by step through the medium of a subjacent spur gear 311|a (Fig. 26) having fast thereto, concentrically thereof, a. gear 302a meshing with a similar gear 303a fixed to said counter wheel 300a concentrically thereof. Each gear 302a has fast thereon a transfer tooth 304'l which, upon rotation of a counter wheel 300* of lower order from 0 to 9 or vice versa, engages a transfer gear 305a in the counter wheel of next higher order to impart a half step of rotation thereto. Suitably journaled in the main frame F (Figs. 1, 11, 12 and 26), lengthwise of the revolutions counter RC and below the spur gears 30|, is a counter driving shaft |18. The counter driving shaft ||8 is equipped to complete the transferring operations in said revolutions counter RC as follows: Adjacent one of its ends, the shaft ||8 is provided with a pair of opposed transfer blades 2|2, 2|2a spaced part circumferentially of said shaft and inclined relatively to the longitudinal axis thereof. Located along the shaft H8 from said blades,

-at equidistantly spaced intervals, are rib-like transfer teeth T. The blades 2|2, 2|2a are so designed that in the different denominational positions of the carriage C, one of the other of said blades, during each rotation of said shaft in one direction or the other, imparts a complete step of movement in like direction to the particular spur gear 30|EL with which it is at that time operatively related. The spur gear 30|, in turn, transmits this one step of movement to its corresponding counter wheel 300. Because of the automatic step by step movement of the carriage relatively to the blades 2|2, 212, a one step movement is imparted to successive counter wheels 3001. It will, of course, be understood that the counter wheels 300a are rotated in opposite directions for addition and subtraction respectively. The transfer teeth T are so arranged that the end portions thereof are disposed in oppositely related spirals around said shaft |18. One end of the transfer teeth T namely 2|3 to 2|8 are effective in one direction of rotation of said shaft ||8 to impart half a step of movement to the spur gears 30| of these counter wheels 300i to which half a step of transfer movement has been imparted by transfer tooth 304 whereby transferring as regards said wheels' is completed. The other ends of said teeth T namely 2|3 to 2|8 (Fig. 12) are effective in the other direction of movement of said shaft I8 to similarly operate said spur gears 30| and the related counter wheels 300 in the opposite direction. In Fig. 12 a diagrammatic representation of the blades 2|2, -2I2 and the teeth T has been shown. It is to be understood that the blades 2|2, 2|2EL and the transfer teeth T are spaced around the shaft ||8 so as to leave a clear, unobstructed path for the movement of the spur gears 30|* in the normal position of said shaft as the spur gears and carriage shift in either direction denominationally. The shaft ||8 is yieldingly held in its normal position by means of a locking bolt ||8a mounted in brackets ||8b and tensioned by a spring ||8c to engage a notch |||1c1 in said shaft ||8.

CARRIAGE SHIFT RIGHT AND LEFT The carriage C is shifted to right and left through the medium of a carriage shift clutch |40 (Figs. 3 and 5) on the main drive shaft 5. The carriage shift clutch is of the single revolution type and comprises opposed housing members |40, |40,b loose on said shaft and between which a trip pawl |81 is suitably pivoted to engage and disengage the ratchet tooth |61 of a sleeve |68 fast on said shaft 5. A suitably arranged spring |81a tensions said pawl |81 to normally engage the same with said tooth, but the pawl is normally held in idle position by contact with a clutch-tripping dog |6i, as hereinafter more fully explained. The carriage shift clutch |40 is operatively connected to the usual carriage propelling rack |1EL (Fig. 2) on said carriage by means of a carriage driving gear |88 on the member |40a and reverse gearing between said gear |98 and rack I1a as follows. Suitably journaled in the main frame F is a sleeve 221 (Fig. 13) having fast on one end thereof a pin gear 221* cooperating with said rack |1EL to shift the carriage C step by step. A detent lever 221J cooperates With the pin gear 221a for a purpose unimportant to the present invention and which, therefore, requires no explanation. Rotatably mounted on the sleeve 221 is a pair of carriage reversing gears |33, |34 constituting right shift and left shift gears, respectively. The gear |33 meshes directly with the carriage driving gear |88. The gear |34 is driven by said gear |88 through the medium of an idler gear |89 (Fig. 3). A draw key |38, (Fig. 13), is slidably mounted in the sleeve 221 for endwise setting in opposite directions, respectively, to alternately couple said gears |33, |34 to said sleeve by means of a key bit |38 thereon sliding in a key Way 221c in said sleeve and in key Ways |33 and |34 in said gears, respectively. As will be understood, the draw key |38 in its opposite settings, conditions the carriage reverse gearing for right shift and left shift movement of the carriage.

'I'he draw key |38 is set under control of the carriage right shift and left shift keys i5 and I4, and also by the carriage C, through the medium of a swingably mounted gear conditioning unit (Figs. 2 and 21) comprising three levers 23|, 233, 226, at the rear of the machine, interconnected for unitary swinging movement in opposite directions and also for relative movement. A link 203 connects the lever 226 to the draw key setting lever 224 operatively connected to said keys |38, |39, so that movement of said lever in left and right directions shifts said draw key |38 (Fig. 13) into its opposite settings. The draw key |38 is normally set to couple the carriage left shift gear |34 to the sleeve 221, in other words to condition the carriage reverse gearing for left hand shift of the carriage C, by means of a rocking bell crank |36, (Fig. 21), operatively connected to lever 233, by means of a bolt 239, and tensioned by a suitably connected spring 223. The carriage right shift and left shift keys |5 and |43 are operatively related to said gear conditioning unit by means of a pair of bell crank levers 239 and 263, respectively, adapted to swing Said unit in opposite directions to condition the carriage reverse gearing for right and left shift of said carriage C. A link 223 operatively connects the carriage right shift key lever 99 (Fig. 15) to its related bell crank 230. .A similar link 262 operatively connects the carriage left shift key lever 26| to its related bell crank lever 263. The condition of the carriage reverse gearing is reversed in the left and right hand limits of movement of the carriage C, respectively, by means of left and right hand tappets |35 and |37 `(Fig. 21) adapted, respectively, upon movement of said carriage into said limits of movement to rock said bell crank |36, and hence the conditioning unit, in opposite directions.

The pair of bell cranks 230, 263 (Fig. 18) are provided with fingers 2338, 269, respectively, which, upon depression of said keys I5 and M, contacts with lateral crank arms 234, 265, (see Figs. 18 and 19), of a crankmember 235 fast upon a transverse clutch control rock shaft |62, to rock said shaft in one direction, that is to say, counter-clockwise as viewed in Figs. 14, 18 and 19. Such rocking of said shaft |62 effects engagement of the carriage shift clutch and also starts the motor by means to be hereinafter described under the succeeding heading Control mechanism. It may be mentioned that the clutch control rock shaft |62 is interconnected with the lever 23| of the described conditioning u nit for the carriage reverse mechanism by means of the angular tongue 2353, 235b pivoted on said crank 235 and the projection 23|a on said lever 23|, during continued depression of the carriage right shift key I5 so that the carriage C continues to shift in the right hand direction until said key is restored to normal. The carriage right shift key, if in depressed position, is restored by the carriage as it reaches the limit of its travel to the right, through contact of the carriage left hand tappet |35 (Fig. 21), with the upper end of the bell crank lever |36. The left hand tappet |35 rocks the bell crank lever |36 clockwise, and such lever, through the pin-and-slot connection 239, rocks the lever 233 counter-clockwise. The horizontal arm of the bell crank 230 is connected with the carriage right shift key I5 .by link 228. As the bell crank 230, upon depression of the carriage right shift key, rocks the lever 233 clockwise and maintains it in such position, movement of the bell crank |36 in clockwise direction restores the/ carriage right shift key I5 to normal.

The carriage left handv tappet |35 imparts a movement to the lever 2332L of such extent as to rock it together with the associated levers 226 and 23|, to condition the carriage reverse gearing for left hand shifting operation. Also under continued depression of the left shift key I4, similar results are obtained as regards travel of the carriage and return of said key. However, these features of the carriage right shift mechanism form, per se, no part of the present invention, being the subject matter of my copending application Serial No. 147,587, filed of even date herewith, and detailed description, thereof, is therefore thought to be unnecessary herein.

`jack shaft |83 is Darvn 'ro AccUMULAToB Beside the carriage shift clutch is a value entering clutch |93 (Figs. 3, 5) identical in construction with the carriage shift clutch and including housing members |933, |93b rotatable on said shaft and a trip pawl |59 tensioned by a spring |65 to normally engage the before mentioned ratchet tooth |97. The same clutch tripping dog i6! normally engages the trip pawl |69 to hold it idle. One clutch member, |939, is operatively connected to a suitably journaled jack shaft |93 (Figs. 3 and 9) by means of a pair of intermeshing gears |9I, |92 fixed to said member and jack shaft, respectively. A crank disc |89, fast-on said shaft |63, and a pitman rod |58, (see also Fig. 14), are operatively connected to the diiferential actuator racks R to impart a reoiprocatory cycle of movement thereto during each revolution of the value entering clutch |63. For a detailed disclosure of the operating connections attention is directed to the previously noted Patent No. 1,011,617. Subjacent to the accumulator A is a suitably journaled tens transfer shaft |93, (Figs. 3, 9 and 10), to which the geared by bevel gears |82, |92b. The accumulator transfer shaft |93 is provided with transfer cams |92 operative upon the before mentioned transfer dogs 3|2 (Fig. 25) as described in Patents Nos. 1,011,617 and 1,566,961.

Intermediate the driven gears 3| 0 of the accumulator A and the actuator racks R is the before-mentioned coupling mechanism comprising a series of denominational gears 308 rotatably mounted in a longitudinally split shaft 309 (Figs. 9, 10, 25) suitably journaled in the main frame F for rotation to intermittently mesh said gears 308 with said gears 3 0 and with the driving gears 306 of the value setting up mechanism. The shaft 309 is rotated intermittently by the transfer shaft |93 through the medium of a pin gear |93a fast on the latter, and meshing with a suitably mounted Geneva gear |93b, and a gear train |93c (Fig. 10) between said Geneva gear |93b and' the shaft 309. For the present purposes, it is ,sufcient to explain that the described coupling -mechanism provides for coupling the gears 396 and appropriate gears 3I0 during each forward stroke of the actuator racks R and uncoupling the same during the return stroke of said actuators. Y

DRIVE To REvoLUTIoNs COUNTER Intermediate the transfer shaft |93, (Figs. 4 and 8), and the revolutions counter driving shaft |I8 is a counter driving, reversible gearing as follows. Fast on said shafts |93 and |I8 are gears |939, H86, respectively. suitably journaled in the main frameF is a sleeve I|'|, (Fig. 6), having a fixed gear |I`|e thereon meshing with gear |I8e. Rotatably mounted on the sleeve I|`| is a pair of forward and reverse driving gears 209. 208, (see also Fig. 7), for use in positive and negative operations, respectively. The gear |93d meshes with the reverse driving'gear 208 and also drives the forward driving gear 209 by way of twin idler gears 209e, 209D. A draw key ||4 slidably mounted in the sleeve I'| is settable in opposite directions therein to couple said gears 209. 208 to said sleeve, respectively, through the medium of a key bit ||5 on said key, key waysv 209, 208 in said gears, respectively, and a key way ||'|h in said sleeve. The draw key ||4 in this instance is also settable into an intermediate position (Fig. 7) wherein both gears 209,

Ann Ann Spenser CoNnrnoNmc Means The machine is equipped with add and subtract conditioning means which will be briefly described at this point.

'Ihe actuator racks R are conditioned for addition and subtraction through the medium of a transverse rock shaft |01 (Figs. 14, 22 to 24) having fast thereon an actuator conditioning crank |02, one end |02* of which is operatively connected to the before mentioned locking bolt to set the same in opposite directions upon rocking movement of said shaft |01 in opposite directions, respectively. The oppositeI end of said crank |02 has secured thereto a lateral stud |0| for a purpose to be described. The "add and su keys 1 and 8 are operatively connected to said shaft |01, through the parts 240, 24|, 242, 243- and 240, 24|, 242 and 243, respectively, so that said shaft is rocked in one direction or the other upon depression of the appropriate key.

Coincidentally with the conditioning of the actuator racks R for addition or subtraction, the revolutions counter RC is correspondingly conditioned by means of a vertically disposed double crank |06 fast intermediate its ends on the shaft. |01, a draw key setting bell crank (Figs. 6 and 25). pivoted at a fixed point, by means of a screw 2 I0, and operatively connected to said draw key, and a draw bar 96 pivoted at one end to said bell crank for vertical movement thereon and to the other end of which draw bar said crank |00 is operatively connected as follows. The crank |09 has formed therein a pair of upper and lower substantially triangular apertures 3|6, 3 4 disposed upon opposite sides of said shaft |01 and terminating adjacent opposite ends of said crank |00 in upper and lower notches 29|, |20, respectively. The draw bar 96 is provided with upper and lower studs 290 and ||0, respectively, so arranged that upon vertical movement of said draw bar in opposite directions, said studs 290, ||0 may be engaged with said upper and lower notches, respectively. Under normal adding and subtracting conditions, the dr-aw bar 96 is held elevated by means presently described, with its upper stud 290 engaging the upper notch 29| whereby, upon rocking movement of the shaft |01 in opposite directions, the draw key H4 is set in opposite directions to condition the counter reverse gearing for addition and subtraction as will be understood. Between the studs 290, ||0, the draw bar 96 is provided with a central slot 96n of hour glass shape into which one end of the shaft |01 extends, said slot permitting vertical movement of the draw bar 96 and cooperating with said end of shaft |01 to limit relative movement of the crank |06 and draw bar 96 in a manner immaterial to the present invention.

The carriage shift and value entering clutches |400, |43 are controlled by means of a clutch tripping dog |6| (Figs. 3, 14) fast upon the before mentioned clutch control rock shaft |62 and normally occupying an intermediate position in which both clutch pawls |91 and|64 are tripped and said clutches thereby disengaged. The clutch control shaft |62 is mounted to 'rock in opposite directions to carriage shift and value entering clutch engaging positions, respectively, to effect, in a manner which will be understood,

alternate engagement of said clutches |40, |40. A pair of segmental combs 20|, 260 (Fig. 5), on

, the clutches |40, |42, respectively, block movement of the tripping dog |6| to said positions until which ever clutch is engaged has completed a full revolution.

The clutch control shaft |62 is rocked in op- DOsite directions under control of the add and "sub keys 1 and 0 (Fig. 5), through the medium of a key locking bail 00. The bail 00 is swingable in the clockwise and opposite direction on a transversely extending shaft 51 (Fig. 25),

\\ suitably mounted for rocking movement for a purpose to be explained. The key locking bail (Fig. 25), in its forward swinging movement engages depending arms |40, on the key locking bars |49 and Iblocks movement of the latter to key releasing position. In its forward movement said bail 60 cooperates with an arm |50 (Fig. 14), on a tensioned yoke I 5| vertically swingable on a transverse shaft |52, and swings said yoke |5| in one direction in opposition to the tension exerted thereagainst by a spring 5P. Such movement of yoke |6| swings'a clutch control rocker |60, journaled on the clutch shaft |62, in one direction from a Enormal position, by means of a link |53 connected to said yoke and to a depending arm |54 on said rocker'l60 (Fig. 14). The rocker |60 is operatively connected by a tension spring |59 to a lateral arm |6| of the clutch tripping dog |6| so that such swinging of said rocker acts to urge the dog |6| into value entering clutch engaging position. An arm |51 on the rocker |60 overlying the laterally bent arm |6I of the dog |6|, rocks said dog |6| into intermediate position upon movement of said rocker |60 back to normal position in a manner described inthe Patent 2,143,741.

The motor is energized by means of a pair of fixed and movable contacts |42, |4|, the latter carried by a resilient contact carrier |80. The contacts |4| and |42 are opened and closed under control of a cam |18, |19 on the main drive shaft 5, a contact opening and closing lever |16 pivoted intermediate its ends, by means of a rivet |15, on an arm |12 of a carrier |13 for movement thereon by said cam, and a suitable spring |11 urging said contact controlling lever into contact with said cam. The carrier |13 is pivotally mounted on a shaft 85 for movement against the tension of a spring |14, to shift the lever |16 from a normally ineffective to an effective position. Upon swinging movement of the clutch control rocker |60 in the direction above indicated, an arm |69 thereon engages a roller |10 on said carrier and swings the latter in the proper direction to shift the lever |16 to eifective position.

The key locking bail 80 is swung forwardly by depression of the add and sub" keys 1 and 8 through the medium of a vertically swingable and laterally shiftable lever 255 depressible by either of said keys through the medium of studs 1*, 9L on the key levers thereof, respectively, overlying said lever 255 in the normal position of the latter. The lever 255 is pivotally mounted on a stud 255 projecting from the adjacent rlght hand side frame of the machine. 'A suitably connected spring 255'i tensions the lever against movement from normal position. The spring 255'l normally holds the rear end of the lever 265 upwardly. Alongside the lever 255 is a slide 256 endwise settable in opposite directions by a repeat key lever i2, the slide also being laterally shiftable. The lever 255 and vslide 256 are coupled together for lateral movement in unison by a headed stud 255b on the rear end of the lever entered in a bayonet slot 256 in the slide 256 to support the latter at its rear end, and enable independent swinging and setting of the lever and slide, respectively. In the rearward position of said slide 256, a cam |845 on `the crank disc |84 shifts said slide and lever 255 laterally at the end of a single cycle of operation of the machine so that said lever clears the stud 18 or 1b of whichever key 1 or 8 is held depressed, whereby said lever is free. to return to normal position under the tension of its spring 2555. In the opposite setting of said slide 256, the cam I 84a is ineiective thereagainst and the machine executes repeat operations as long as a key 1 or 8 is'held depressed. It will, of course, be understood that coincidentally with the return of the lever 255, the key locking bail 80 is returned to normal position by the tensioned yoke |5I, the rocker |60 is likewise returned vto normal position by said yoke as described in the Patent 2,143,741 thereby swinging the clutch tripping dog |6| to its intermediate position in which both clutches |40, |43 are tripped and the carrier |13 is released by the arm |69 of said rocker |60 for return to normal position by its spring |14, whereby the motor contacts I 4|, |42 are opened in a manner which will be clear without detailed explanation.

DIVISION MEc'HANrsM The key lever 42 of the division key i5 is pivoted on a short transverse shaft 24 (Fig. 17) for depression against the tension of a suitably connected spring 45, (Fig. 15). A guide plate 29 establishes the normal position of said lever. Alongside said key lever 42 (Fig. 15) and also pivoted on the shaft 24 is a bell crank rocker 50 having a lateral lug 48 underlying said lever 42. A link 55 (Figs. 15 and 25) operatively connects said rocker 50 to a crank 55 fast on one end of the before mentioned shaft 51 which, through said link 55 and crank 56 and rocker 50, is rocked by depression of said key lever 42 for a purpose presently clear. Fast on the opposite end of the shaft 51 is another crank 95 having a stud 91 thereon engaging a slot 98 in the before mentioned draw bar 96, whereby said bar is supported for vertical movement by said crank 95 relative to the before mentioned crank |08 and is also longitudinally movable relative to crank 95 by crank |08. Also alongside the key lever 42 (Fig. 15), and pivoted on the shaft 24 is a bell crank lever 62 and a lever 59 for operating the same, the lever 59 having a lateral lug 58 underlying the key lever 42 whereby depression of said key lever 42 rocks said lever 59. A tension spring 6| yieldingly connects the lever 59 to said lever 62 so that the bell crank lever 62 is rocked with the lever 59 under depression of the key lever 42, against the tension of a suitably connected spring 1|.

The purpose of the yielding connection between said levers 59 and 62 will later be explained. Cooperating lugs 63 and 64 on 0pposed ends of said levers 59 and 62 limit the relative movement of said levers to one another under the urge of the spring 6|.

One end 65 of the. bell crank lever 62 is operatively related to a rocking control bail 66 disposed transversely of the machine and swingably mounted therein in holes 66B. A suitably connected spring 61 tensions the bail 68 against -roller 18 thereon overlying a crank arm 19 extending from the before mentioned key locking bail 80. The arrangement ofthe bails' 66 and 80 is such that upon rocking of the bail 68 by the bell crank lever 62', the key locking bail 80 is rocked counter-clockwise as viewed in Figs. 14 and 25, into its key locking position. As previously explained under the heading Add and subtract conditioning means said bail 80 is connected to the clutch control rocker |60 to swing the same, tension the spring |59 and urge the clutch control dog |6| into value entering clutch engaging position.

The bell crank lever 62 forms part of an automatic value entering conditioning mechanism best shown in Figs. 13, 14, 15. Said mechanism includes a transverse rock shaft 85 having a pair of crank arms 84 and 203 fast upon its opposite ends, respectively, an eccentric 220 fast on the right shift gear |33 of the carriage reverse gearing, a pitman-rod 202 connecting said eccentric to the crank arm 203, and a forwardly extending coupling bar 83 pivotally connected to the crank arm 84 to swing vertically thereon for coupling to the stud |0| of the actuator rack conditioning crank |02 before mentioned. The coupling bar 83 is provided With a V-shaped notch |03 in its under edge overlying said stud |0| and adapted-to cam said stud |0|, upon downward movement of said bar into engagement with a seat |06 towards which the conveying walls of the V- shaped notch lead, whereby said bar 83 is coupled to said crank. The purpose of camming the stud |8| will be 'explained subsequently. The coupling bar 83 is swung vertically into and out of coupling position through the medium of the bell crank lever 62 to which said bar is connected by a suspension link 8| pivoted to the lever 82, by means of a rivet 82, and to the coupling bar 83 by means of a rivet 02a, (Figs. 15, 16). As will be more clearly explained subsequently, the eccentric 220 rocks the shaft 85 to reciprocate the coupling bar 83 whereby the actuator rack conditioning crank |02 is oscillated to reciprocate the locking bolt 99 andv otally and slidably mounted on the left hand end of the carriage C, on a short shaft |29 (Fig. 18), extending from front to rear of said carriage, is a horizontally disposed overdraft flap |28 slidable on said shaft into two different positions relative to the transfer slide |32 of highest denomination of the accumulator A. 'I'he overdraft flap |28 (Figs. 18, 20) is provided along its right hand edge with a pair of laterally spaced lugs 201, |30 of. different lengths adapted, in the diierent positions of said ilap, to be aligned with and engaged by an oiset and recessed lug |31 on the transfer slide |32 under different conditions obtaining in said register, whereby the left hand edge of said flap 28 is rocked downwardly by Said transfer slide. It will be remembered that .the transfer slides 3| 2 (Fig. 25), and |32 (Figs.

18 and 20), are operated at each operation of the value-entering clutch mechanism |43, through the trains of gears (Fig. 3), |8|, |82, |82, |82, shaft |93 (see also Figs. 9 and 10), and cams |82. Unless s, transfer operation is required, the upward projection of these transfer slides 3|2, |32 is idle. With this in mind, therefore, it is obvious that the special transfer slide |32 on its upward thrust, may or may not strike the lugs 201, |30 of the overdraft flap |28, depending upon two conditions, namely, the position of the adjustable flap on its rod |28, and secondly, whether or not the special transfer slide itself has been adjusted into transferring position. In the present instance, the special transfer slide |32, when conditioned to effect a transfer operation, as in the case of an overdraft, will contact one of the lugs 201, |30 where-- as when the transfer slide |32, in a non-transfer position, is merely projected upwardly incident to the operation of the machine, it may or may not contact the other of the lugs to rock overdraft flap |28, depending upon the adjusted position of the flap, as will be more fully explained hereinafter. An upright overdraft conditioning or flap-adjusting lever |26 is suitably pivoted on the carriage C for rocking movement forwardly and rearwardly, one arm of the adjusting lever being forked to engage and slide said flap into its different positions, respectively.

The overdraft conditioning lever |26 is rocked by means of an overdraft conditioning bail |24 pivotally mounted in the machine to rock about a horizontal axis |25, the bail extending alongside the carriage C throughout the length of travel thereof. The lower end of the flap-adjusting lever |26 is also forked to slide along said bail |24 during travel of said carriage. The overdraft conditioning bail |24 is rocked by means of an upright lever |23 pivoted intermediate its ends on a fixed part of the machine and operatively connected at its upper end to said bail.

The lever |23 is rocked by means of the actuator rack conditioning crank |02, to the stud of which said lever is connected by means of a link |2| paralleling the coupling bar 83.

Alongside the overdraft, conditioning bail |24 and rocking about the axis |25 thereof, is a clutch control iiap |89 terminating at its left hand end short of the limit of travel of the carriage C and consequently of the left hand end of the bail |24. The clutch control flap |89 is operatively connected to the clutch control shaft |62 by means of a pair of opposed lever arms |80, |86 on said ilap and shaft, respectively, and connected together by a slot and pin connection |81, |88, thearrangement being such that downward or clockwise, (Fig. 18), rocking of the flap |89, rocks the clutch control shaft |62 counter-clockwise and consequently the clutch control dog |6|, to effect engagement of the carriage shift clutch |40 against the tension of the spring |58.

'I'he clutch control flap |89 is rocked downwardly by the overdraft flap |28 through the medium of an overdraft slide |8| (Fig. 20), of. plunger like form suitably mounted on 'the carriage C for vertical sliding movement against the tension of a suitably connected spring |95 (Fig. 20). A screw |29b and a slot |293 in said slide 8| limit upward movement of the latter. 'I'he overdraft flap |28 is operatively related to saidv slide |8| by a laterally extending lug |84 overlying the upper end of said slide. The clutch control ap |89, in the normal position of the clutch control shaft |82, is spaced from the overdraft slide |3| to movement of said iiap |89 counter-clockwise, (Fig. 18), without operating slide |8| when said shaft |62 and the clutch control dog |6| are rocked in a direction to ef- {ct engagement of 4the value entering clutch At the 1eft hand end of the clutch contra las is a disabling rocker |41 rocking vertically about the axis |25 of said flap |88 and adapted to be depressed by the overdraft vslide |8| when the carriage C is at its left hand limit of movement.

yThe disabling rocker |41 is operatively connected by a vdepending arm |46 and a link |45 to a baillike special key locking frame 3| (see also Fig. 15), pivotally mounted for swinging movement into and out of key locking position. A suitably connected 'spring 32 urges the key locking frame 3| toward locking -position and tensions said rocker |41 against depression. In its locking position the frame 3| engages a notch 41 in the division key lever 42 and locks said lever in depressed position. Depression of the disabling rocker |41, by the plunger |8|, swings the key locking frame 3| to unlocking position, whereupon the division key lever 42 returns to normal position, thereby terminating the operation of the machine in a manner presently described in detail.

QUoTIENT DIFFERENCE DIvIsIoN The key lever 23 of the quotient difference division key |8 is pivotally mounted on the before mentioned shaft 24, adjacent to the division key lever 42, for depression against the tension of a suitably connected spring 35. The key lever 23 is designed to operate a rocking yoke 40 having two arms 39 and 4| extending alongside the key lever 23 and the before mentioned lever 58, respectively. The yoke arm 38 is provided with a lateral lug 38 underlying the key lever 23 whereby, when said lever is depressed, the yoke is similarly operated. 'Ihe yoke arm 4| overlies a laterallug 58 on the lever 58, whereby said arm operates the latter in the same manner as the divisionv key lever 42, to rock the bell crank lever 62. The .before mentioned suspension link 8| forms a part of the quotient difference division mechanism in that it is adapted to .couple the bell crank lever 6 2 to the carriage right shift key I5 so that under depression of the quotient difference division key |8, said carriage right shift key |5 is depressed prior to complete depression of said quotient dierence division key 8 as and for a purpose explained as this description proceeds. To this end, said suspension link 8| is provided with a lateral lug 86 (Figs. 15 and 16) which is designed to seat in a notch 93 provided in one edge of a coupling link 88 pivotally suspended, in the hole 89, from the key lever of the carriage right shift key |5 alongside said link 8|. A tension spring 8| extending between and suitably connected to the lower ends of said links 8| and 88 urges the same in a direction to enter lug 86 in the notch 83. Upon depression of the division key I6, certain conditions hereinafter specified obtaining, the link 8| is swung in one direction by the coupling liar 83 under control of the eccentric 220 (Fig. 13') to move the lug 86 out ofthe notch 83, then swung back with the lug 86 below the end of the link 88 by the before described lowering of the coupling bar 83, (due to continued depression of the division key 6 which maintains the rear arm of the bell crank 62 depressed). The link 8| is subsequently moved upnotch 93 under the urge of the spring 9|.

. of the spring 53.

n anism to the state control shaft |01.

wardly by elevation of the coupling bar 83, upon the release of the division key I8, to reengage the lug 86 with said notch 93. To facilitate such reengagement, the lowerend of the link 88 is provided with a .cam edge 231 coacting with the lug 86 to cam the lug into a position to enter said A stop lug 92 on the link 88 engaging a fixed part of the machine, holds the link 88 stationary against the action of the spring 9| during such camming action and also during swinging movement of the link in said direction.

OPERATION 1N DrvIsIoN shifted will be understood from the previous description of the carriage drive. The dividend 390,625 is now entered in the accumulator A, preferably in the six value wheels 501 of highest denomination. The divisor 625 is then set up by value keys K corresponding in denominations to those of the three highest digits f the dividend. It is not, as will =be understood, necessary to enter the dividend and set up the divisor in. the denominations indicated. However, the procedure described will suice for the purpose of illustration. When the carriage C is nearly at the limit of its right hand travel, the condition of the carriage reverse gearing was reversed by coaction of the tappet |35 (Fig. 21) and the bell crank |36, whereby the before-described gear conditioning unit was swung in a direction to cause the left shift gear |34 (Fig. 12), to be coupled to the sleeve 221.

The division key i6 (Fig. 15) is next depressed, the key locking frame 3| coacting with the notch 91 in the division key lever 92 to lock said key down, as will be clear, against the urge of the spring 05. In the depression of said key |6 the lever 42 thereof acts on the lug 48 of the rocker 50 and rocks the latter clockwise, as viewed in Fig. 15, round the shaft 29 against the tension The rocker 50, through the depending arm 52 thereof, the vcrank arm 56 (Fig. and the link 55, rocks the shaft 51 and crank 95 thereon clockwise, as viewed in Figs. 14, 15 and 25. Coincidentally with the movement of the rocker 50, shaft 51 and crank 95, said key lever 02, by engagement with the lug 58, rocks the lever 59 clockwise, whereby, through the connecting spring 6|, the bell crank lever 62 is also rocked clockwise, the suspension link 8| thereon lowered and the recessed portion |03, |06 of the coupling .bar 83 lowered into engagement Iwith the stud I0| of the crank |02, thereby coupling the automatic actuator rack conditioning mech- If the lock Ibolt 99 is -already set to condition the actuator racks R for addition, the camming edge |03 of said bar 83 engages the stud I0| of the crank |02 and moves said crank and the locking bolt 99 into its opposite setting, to thereby condition said actuator racks R for subtraction, said stud |0| entering the seat |06 ofsaid bar 83, whereby the latter is coupled to the crank |02. During such camming of the crank |02, the control shaft |01 and the double crank |08 are rocked counterclockwise, as viewed in Figs. 14, 22 to 24, from their adding positions illustrated in Fig. 22 into the subtracting positions, shown in Fig. 23. It should lbe stated at this point that under adding conditions of the accumulator the upper stud 29| of draw bar 98 engages the upper notch 29| of double crank |08. As a result of the coincidental rocking of the cranks 95 and |08 by operation oi' the divisions key, the draw bar 9B is moved down- Wardly by the pin and slot connection 91, 98 to crank 95 to disengage the upper stud 290 from the upper notch 29| of said crank |08. During downward movement of said draw -bar 96, the

-lower stud H0, (Figs. 22 and 23) thereon engages the inclined edge |09 of the lower recess 3|! in the double crank |08 4which is simultaneously rocked into the path of the stud ||0 by the camming action of the inclined edge |03 (Fig. 16), of the link 83, on the stud |0| (Fig. 14), whereby said draw .bar 96 is cammed endwise in a direction to set the draw key H4 in position to couple the forward driving gear 209 to the sleeve whereby the revolutions counter RC is conditioned for addition. In the set position of said draw key H0, said stud 0 engages the lower notch |20 of the double crank |08, thereby locking said draw key ||4 in set position and therefore the revolutions counter RC in adding condition.

The described rocking of the actuator rack conditioning crank |02 to subtracting position moves the link |2| rearwardly and the lever |23 counter-clockwise, from. the position shown in Fig. 14, thereby rocking the overdraft conditioning bail |24 clockwise. Clockwise rocking of said bail |24 swings the overdraft flap |29 forwardly to the position shown in Fig. 18 so that the lug |30 thereon is aligned with the lug |5| of the transfer dog |32 associated with the accumulator wheel 301 of highest denomination.

In the described rocking movement imparted by the division key i6, upon its depression, to the lever 59, the spring 6| is tensioned to rock the bell crank 62 (Fig. 15), which, through lug 95, rocks the bail 66 clockwise against the tension of its spring 61, whereby through coaction of the roller 18 and arm 11, the key locking bail 80 is swung around the shaft 51 counter-clockwise. By such rocking of the bail 80, the clutch control rocker |60 (Fig. 14), through the described connections |50, |5|, |53 is rocked clockwise, as viewed in Fig. 14, thereby tensioning the spring |59 and rocking the clutch control shaft |92 and clutch tripping dog |6| clockwise from their normal intermediate positions. The value entering clutch |03 is thus engaged, the carriage shift clutch |40 remains disengaged, and the motor is energized, all as previously described under the heading Add and subtract conditioning means. Y

Incidentally, as described in the foregoing, the depressed value keys K are locked down as will be understood.

As an incident to rocking of the clutch control shaft |62, the control flap |89 (Fig. 18) is rocked on the shaft |25 by the lever arms |89, |90, counter-clockwise Ias viewed in Fig. 18, to the limit ol.' its movement in this direction which is sufficient to position the upper, inclined edge of the flap 89 in line with the overdraft slide I9 The machine now -performs a cycle of operation during which the divisor 625 is subtracted from the dividend 390,625 by complemental addition and the revolutions counter RC is operated to register "1 in the counter wheel 300a of highest denomination.

In the example given, as will be understood, no transfer occurs in the highest denomination of the accumulator A and the transfer dog |32 of highest denomination is not conditioned for transferring operation. However, as described in the of said flap depresses the overdraft slide Il I previously noted Patents Nos. 1,011,617 and 1,566,961, said dog is raised by its associated'transfer cam |92 at the end of the cycle of operation of the machine. Such movement of said transfer dog rocks the overdraft iiap I28 counterclockwise (Fig. 18) whereby the lug |94 (Fig. 20)

De- .pression of said slide |9| rocks the control flap |89 clockwise to the opposite limit of its movement, whereby the clutch control shaft |62 is rocked counterclockwise past its normal intermediate position. In the rocking of said shaft |62, as will be clear from the foregoing description, the clutch tripping Vdog I6| is swung into a position to effect disengagement of the value entering clutch I43 and engagement of the carriage shift clutch |40. Since the clutch control Arocker |60 is held stationary by the locked division key I6 and the connections 59, 6I, 62, 65, 66, 19 etc., counterclockwise movement of the clutch control shaft |62 and said dog I6| is against the tension of the spring |59, (Fig. 14). As 'will be understood from the previous reference to the clutch combs 20| and 260 (Fig. 5), the engagement of the carriage shift clutch |40 is not effected until the value entering clutch |43 has rotated suinciently to complete the cycle of operation of the actuator racks R. The carrier |13 is still held, by the arm |69 of the rocker |60, in the position previously described in which the contact control lever |16 is located in its effective position relative to cam |18, |19 so that the motor I is still energized. Hence the carriage C is shifted one step to the left.

As soon as the transfer dog |32 (Fig. 18) is released .by its transfer cam |92, the overdraft slide |9I is raised by its spring |95, and thereby releases the control flap |89. 'Ihis releases the clutch control shaft |62 and clutch tripping dog I6| for return under the urge of the tensional spring |59 to effect disengagement of the carriage shift clutch |40 and engagement of the value entering clutch |43. Such operation of said shaft |62 and dog I6| is blocked by the comb 20| of the carriage shift clutch |40 until said clutch has completed its cycle of rotation, at which point the carriage shift clutch |40 is disengaged and the value entering clutch |43 engaged, as will be clear without further explanation.

It is obvious that with the division key I6 depressed, the shift of the clutch tripping dog I6| by pressure of the overdraft slide I9| on the flanged upper edge of the automatic carriage shift control flap |89, is effected against the tension of the spring |59 of the clutch tripping dog I6|. This spring, therefore, is thus made effective to restore the clutch tripping dog I6| to position wherein the carriage shift clutch |40 is held idle, while the value entering clutch |43 is free to operate.

Referring now to the automatic actuator rack conditioning mechanism, it should be explained that the ratio of drive to the carriage C is such that the gears |33 and |34, (Figs. 3 and 13) and the sleeve 221 turn through half of a revolution in each step of movement of said carriage and that the eccentric 220 of said conditioning mechanism occupies low and high stroke positions in alternate half rotations of said gears. Under subtraction conditioning of the actuator racks R by said conditioning mechanism, said eccentric 220 occupies its low stroke position.

During the above-described leftward carriage step movement, 'the eccentric 220 moves to its high stroke position, Fig. 13, thereby rocking the crank 84 and shaft I6 counterclockwise, as viewed in Fig. 14, to shift the coupling bar 03 forwardly whereby the conditioning crank |02 is rocked in a direction to set the locking boit 86 so that the actuator racks R are conditioned for addition. Such rocking of the conditioning crank |02 rocks the shaft |01, and the crank |06 clockwise, during which rocking movement the stud ||0 of the draw bar 96 remains locked in engagement with the lower notch |20 of the double crank |00, to pull the draw bar 96 forwardly, whereby the draw key ||4 isset to couple the reverse gear 206 to the sleeve ||1 and thereby condition the revolutions counter RC for subtraction. The slot 98 in the forward end of the draw bar permits advance of the draw bar relatively to the stud 91 of the arm 95, which remains stationary.

Coincidentally with the described automatic conditioning of the actuator racks R for addition and the revolutions counter RC for subtraction, the link |2| (Fig. 14), is shifted forwardly by the conditioning crank |02 whereby, through the lever |23, the overdraft conditioning bail |24 is swung counterclockwise, as viewed in Figs. 14 and 18, thus rocking theoverdraft conditioning lever |26 clockwise and shifting the overdraft flap |28 rearwardly from the position shown in Fig. 18, so that the lug |30 thereof is moved out of alignment with the lug |3I of the transfer dog |32 and the lug 201 of said flap |28 is moved alongside of said lug I3II slightly above the same. In this relation of the overdraft ap |28 and transfer dog |32, said dog operates said flap |28 only in the event that said dog executes a transfer operation, in which operation as disclosed in the previously noted Patents 1,011,617 and 1,566,961, said transfer dog |32 is moved both laterally and upwardly.

In proceeding with the example given, the machine now adds the divisor 625 four times to the dividend and subtracts the value 4 in the revolutions counter RC, at which point a transfer occurs in the highest denomination of the accumulator A, or in other words, an overdraft occurs. Under this condition, the lug |3I of the transfer dog |32 acts on the lug 201 of the overdraft fiap |28 and again rocks the latter counterclockwise, thereby again rocking the control flap |89, the clutch control shaft |62, and clutch tripping dog I6| to effect engagement of the carriage shift clutch |40 and disengagement of the value entering clutch |43, all in the manner previously explained.

The carriage C is now again shifted one step to the left. In the meantime, the actuator racks R are conditioned for subtraction by the automatic actuator conditioning mechanism, the revolutions counter RC is conditioned for addition, the overdraft flap |28 is shifted to align the lug |30 with the lug |3I of the transfer dog |32 and at the end of said step the value entering clutch |43 is engaged and the carriage shift clutch |40 disengaged all as will be clear from the previous explanation. It will be remembered that in this relation of the overdraft flap |28 and transfer dog |32, said dog is operative against said flap |28 only when no transferring movement is executed by said dog. Therefore, as soon as this condition obtains the overdraft nap |28 is rocked by said dog |32 thereby rocking the control ap |89, the clutch control shaft |62 and the clutch tripping dog |6I to effect engagement of the carriage shift clutch |40 and disengagement of the value entering clutch |43 in a manner which has been explained and need not be repeated. 

